All vulnerabilities
CVE-2026-112909GHSA-69hj-f68j-2879

filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path

tox-dev filelock
Open in ThreatlineRecord JSON
CVSS
6.1Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 22 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.12%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published20 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.

Text from CVE List

Affected versions 1

  • filelockaffected: < 4.2.1CVE List

References 4